What s your percentile Reports on a students test score such as the SAT or a child s height or weight usu ally give the percentile as well as the actual value of the variable The percentile is just the cumulative propor tion stated as a percent the percent of all values of the variable that were lower than this one The upper arm lengths of females in the United States are approximately Normal with mean 35 8 cm and standard deviation 2 1 cm and those for males are approximately Normal with mean 39 1 cm and standard deviation 2 3 cm a Cecile a 73 year old female in the United States has an upper arm length of 33 9 cm What is her percentile b Measure your upper arm length to the nearest tenth of a centimeter referring to Exercise 3 5 page 84 for the measurement instructions What is your